Malicious PDF — malware analysis report

Static analysis result for SHA-256 f363c7f9ac4821e5…

MALICIOUS

PDF

68.1 KB Created: 2021-10-02 19:35:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bc8d098172d0a5b0076a8d6a49e33e94 SHA-1: 417238b9c4c6ca9e199547eae2e10815be790492 SHA-256: f363c7f9ac4821e5f791e97a99e92546887ad6af00aa2d5c33743404cc0272ca
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous embedded URLs, many pointing to compromised CMS upload directories, designed to redirect users to potentially malicious content. The document's structure and the presence of a link farm suggest an attempt to trick users into clicking through to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/71333885671.pdf In PDF document text
    • https://rsvforum.com/userfiles/file/mivofakovubazawifima.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/20931652247.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161556485bbc06---lewapubamopetegasige.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/fexitagade.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210922214702227789.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/70516867651.pdfIn PDF document text
    • http://sbairs.com/datas/files/sebuzilalirijaxidabobeve.pdfIn PDF document text
    • https://majubesar.com/contents/files/38656674514.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210914/file/16315627738440.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145d585bae60---40579725509.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20211002064316.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/lasasit.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210910171621.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50748828320.pdfIn PDF document text
    • https://jagominum.com/contents/files/73369406474.pdfIn PDF document text
    • http://houselandia.ru/files/50753597459.pdfIn PDF document text
    • https://s-h.cc/uploads/files/202109031934236903.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/27629647692.pdfIn PDF document text
    • https://sklepbonus.pl/userfiles/file/gopewov.pdfIn PDF document text
    • http://www.s-prom.si/fileupload/file/7176726205.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/2l7g6r1vdks443b8r1i8dkhdt5/45715527355.pdfIn PDF document text
    • http://mp-journal.com/media/file/90667679148.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/xulitoxufafemuxol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+change+phone+pattern+lockPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF43 10564 bytes
SHA-256: bb9e9fc0caf77a0c6d1cb319647b28bff6b176b91d327a1896a0b26d82cb2d60
font_01_sfnt_off0000c756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC756 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000df68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF68 14336 bytes
SHA-256: 23e969fa306944e71d0081b9918bd3e31473a45ffcd1670cab4b9e775d66bdaf

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